Eureka, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. South southwest wind around 7 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 7 mph SSW | 0% |
| Tonight | 66°F | Partly Cloudy | 6 mph S | 8% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 7 mph SSW | 37% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph W | 89% |
| Thursday | 80°F | Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 63°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SSE | 16% |
| Friday | 83°F | Mostly Sunny | 3 mph S | 13% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 mph SW | 21% |
| Saturday | 85°F | Mostly Sunny | 7 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 5 to 9 mph S | 11% |
| Sunday | 88°F | Sunny | 9 to 13 mph SSW | 9% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 18% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 18% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 29% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.
Growing snapshot for Eureka
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b
More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Benson
Carlock
Congerville
El Paso
Germantown Hills
Goodfield
Lowpoint
Metamora
Minonk
Panola
Roanoke
Secor
Washburn
Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.